Originally Posted by poke_53
OK here is what I have. Terry Cross (KMW) built 308 with about 3000 rounds through it. I pruchased it with about 2500 rounds fired. I have always loaded my loads to 2.820 and not measured to the ogive. So I got a gauge to measure to the ogive and i started out by seating a bullet softly in a piece of brass to see where the bullet makes contact with the lans. So I got an overall measurement of 2.952 and an Ogive measurement of 2.288. This seems a little long but I am not sure. I am loading 155gr Sierra Palma. Does this seem right or do I need to have the barrel set back for better accuracy or should I shoot at maximum mag length. With 175gr pulled SMK I am getting .6" 10 shot groups at 100yds. But I am switching to 155gr now. Any opinions or advice would be greatly appreciated.
From what I can tell, if you are looking to kiss the riflings, you probably will have to st it back. The 155's are much shorter. If the rifle has 3000 rounds thru it, the throat is more than likely receded, not to a point that it will not shoot, but most .308's shoot better when close to or kissing the throat. Particularly if you are going to a lighter bullet. My coal with 168 smk is 2.820, and it is close to, but not touching the throat. Hope this helps!
AIM SMALL, MISS SMALL. 7 STW